Meet the Medicine Alumni Society Board


Sion "Bill” Carter MD ’87, Chair

Sion "Bill” Carter, MD received his medical degree from USF in 1987 and completed his residency in Radiology at Wake Forest University Bowman Gray School of Medicine. Dr. Carter entered private practice in Pensacola, Florida, becoming partner at the Medical Clinic Center, PA and attending physician in the Radiology section of West Florida Hospital. Leadership roles included Chairmanship of the Radiology department and a Director on the Board governing the 140+ member multi-specialty clinic.

After nine years of practice he obtained additional fellowship training in Musculoskeletal Radiology and MRI and then joined a private practice radiology group in Tampa, FL, where he was a partner and attending physician at St. Joseph’s Hospital for 14 years and past president of SDI Radiology. Sports medicine imaging is a special interest of Dr. Carter and he has reviewed and interpreted MRI exams on many high profile professional athletes since 2001. In 2014 he co-founded a teleradiology company, and in 2016 he joined the Florida Medical Clinic where he is currently in full time practice.

Jane Messina MD '88, Vice Chair

Dr. Jane Messina completed her MD degree at USF in 1988. She also completed her residency in anatomic and clinical pathology and a fellowship in dermatopathology at USF. Dr. Messina joined the faculty in the Department of Pathology and Cell Biology at USF MCOM in Tampa in 1994, where she practiced for 20 years before moving to Moffitt Cancer Center.

She is Senior Member in the Departments of Anatomic Pathology and Cutaneous Oncology at Moffitt, and Professor of Oncologic Sciences, Pathology and Cell Biology, and Dermatology at USF. Her passions include teaching and mentoring of pathology and dermatology residents, as well as the dermatopathology fellow, and practicing within busy diagnostic services at both USF and Moffitt, which treats 1,900 new melanoma patients annually. She has been director of the dermatopathology fellowship at USF since 2011. Her research interests include pathology of the sentinel node, biomarkers of prognosis in cutaneous melanoma, and etiology and treatment of Merkel cell carcinoma, and she has published over 130 papers in peer-reviewed journals.

Aman Bhullar MD '07, Secretary/Treasurer

Aman Bhullar, MD has been active on the Board since 2009. Aman has been passionate about the importance of helping our alumni remain connected with our great University and College of Medicine. Aman is USF COM Class of 2007 and completed an Internal Medicine residency from Albert Einstein Montefiore Medical Center. He currently works as a hospitalist. Aman recently graduated with an MBA from The Wharton School of the University of Pennsylvania and has co-founded healthcare technology start-ups including, PACSPoint.

Valerie Riddle MD '89, Immediate Past Chair

Valerie Riddle, MD has been active on the Board since 2009. She lives in Parrish, FL and is a dual USF graduate - completed her undergrad degree at USF in 1984 and received her medical degree from USF in 1989. Her business, BioPharmAdvisors, LLC, provides clinical trial consulting services to emerging biotechnology and pharmaceutical companies. She serves as a volunteer faculty member in the Morsani College of Medicine and is a member of Women in Leadership & Philanthropy at USF, serving on the Executive and the Mentorship/Scholarship Committees. She also sits on the USF Foundation Board of Directors and serves on its Nominating and Development Committees.


David Cooper MD '96

David Cooper, MD received his medical degree from USF in 1996 and masters in public health from USF in 1999. He completed his residency in Pediatrics at USF/All Children’s Hospital, fellowship in Pediatric Cardiology at Cincinnati Children’s Hospital and fellowship in Pediatric Critical Care at UT Southwestern/Children’s Medical Center Dallas. Dr. Cooper currently serves as the Medical Director of the Cardiac Intensive Care Unit, Heart Institute Safety Officer and Co-Director of the Center for Acute Care Nephrology at Cincinnati Children’s Hospital Medical Center. For the last 13 years, his career has focused on the care of critically ill neonates, infants, children and adults with complex congenital heart disease, with a particular interest in how care delivery in the intensive care unit can impact morbidity. His research is focused on extracorporeal support, acute/chronic kidney injury and patient outcomes. Furthermore, he has had extensive involvement with the Pediatric Cardiac Critical Care Consortium (PC4), including the development of the PC4 Cardiac Intensive Care Unit database that is used to track and improve outcomes for patients with critical cardiac disease.

Eva Austin Crooke MD ’08

Dr. Crooke was born and raised in Pinellas County. She obtained her undergraduate degrees at Florida State University. She received her medical degree from the University of South Florida and also completed her residency in Obstetrics and Gynecology at USF. Dr. Crooke is currently in private practice with The Woman's Group. She is active within the Hillsborough County Medical Society, and serves as the Secretary of the Executive Council and a delegate to the Florida Medical Association. Her 10 year MCOM reunion is approaching and she recently became involved with the USF MCOM Alumni Society as a Class Champion.

Roger W. Greene MD ’87

Dr. Greene is a 5th generation Floridian and a proud member of the USF College of Medicine Class of 1987. He received his undergraduate education at the University of Florida graduating in 1983 with a degree in Chemistry. He completed an internship in General Surgery at USF and then completed residency training in Anesthesiology/Plor Medical Center. In 1991, he returned to Florida and joined the North Florida Anesthesia Consultants in Jacksonville, Florida where he has been in private practice for the past 27 years. He two daughters (Savannah and Christa) ages 23 and 20. He is serving as a Class Champion on the Reunion Committee for the second year in a row.

Corey Howard MD '90

Dr. Corey Howard graduated from the University of South Florida, cum laude and completed medical school at the Morsani College of Medicine. He completed his internship year at the Long Island Jewish campus of the Albert Einstein College of Medicine before coming back to Tampa and USF Health in the department of internal medicine. He served as chief resident at Tampa General Hospital, was the president of the house staff association and was awarded the resident of the year award by the American College of Physicians. He then completed a fellowship in digestive diseases and nutrition.

Dr. Howard has been in private practice for 20 years, completed additional training and certifications in anti-aging, functional and regenerative medicine and obtained the professional certification in plant based nutrition from Rouxbe where he had the opportunity to work with Chef Chad Sarno. He is in private practice and focuses on improving health through lifestyle modification. He has a special interest in the gastrointestinal microbiome and its effect on health and disease.

In addition to his clinical practice, Dr. Howard is actively involved in the policy making side of organized medicine and currently serves as the speaker of the Florida Medical Association and is the chair of the state delegation to the American Medical Association where he plays an active role in the creation of national healthcare policy. Dr. Howard is a highly motivating speaker and regularly engages the public and physicians on the importance of lifestyle as medicine, the science of epigenetics, and the importance of the gastrointestional microbiota. He also teaches private plant based nutrition cooking classes in his office which houses a functional kitchen and yoga studio.

Dolores Lowe MD ’93

Dolores Lowe, MD is a dual USF alumna and completed her BS at USF in 1989 and her medical degree in 1993. She completed her specialty training as Chief Resident in Family Medicine at a University of Iowa program in 1996 and practices adult medicine with an emphasis in Geriatrics in Tarpon Springs, FL.

Rahul Mehra MD, Psychiatry '92

Rahul Mehra, MD is the CEO and Chief Medical Officer of MehraVista Health, LLC. MehraVista Health is a national, Florida based healthcare organization specializing in employee wellness focusing specifically on the improvement of employee emotional health. Clients include large publically traded companies to small privately held not for profits. By background, Dr. Mehra is a Board Certified Child, Adolescent and Adult Psychiatrist. He is a 1992 graduate of the USF Morsani College of Medicine Department of Psychiatry residency program. Dr.Mehra is the first resident to be selected to the Alumni Board and a former Assistant Professor in the Department of Psychiatry at USF.

Gilbert Murimwa, Class of 2019

Mr. Murimwa is an MS3 student serving as the Medical Student Council President for the coming year. He was born in Harare, Zimbabwe to his parents Farai and Catherine Murimwa, and has 3 younger brothers. He has been a Florida resident since the age of 4 and graduated from the University of Florida with a Degree in Microbiology and Cell Science. While at UF he was inducted into the Florida Blue Key Leadership Honor Society. He earned his master's degree in medical sciences while spending a year conducting research at the Moffitt Cancer Center. As a medical student he has been involved with the Student Admissions Leadership Group, giving tours to and hosting interviewing students. He plans to pursue a career as a surgical oncologist.

Chris Pittman MD ’88

Chris Pittman, MD received his medical degree from the USF in 1988 and completed a diagnostic radiology residency at St. Louis University Medical Center followed by fellowships in both Interventional and Vascular Radiology at the University of California – San Diego Medical Center. He is board-certified in Diagnostic Radiology, Vascular and Interventional Radiology, and Venous and Lymphatic Medicine. Dr. Pittman is Medical Director and CEO of Vein911®, practices minimally invasive vein care in the Tampa Bay Area and has been active in medical politics for over 25 years.

He is president of the Florida Medical Association Political Action Committee; Chair, FMA Advisory Committee on Health Care Information Technology; Vice-Chair, FMA Council on Medical Economics and Health Care Delivery Innovation; Member, Board of Governors of the FMA; AMA Alternate Delegate, representing the American College of Phlebology; Member, Board of Directors, American College of Phlebology Foundation; Past President, Hillsborough County Medical Association; Member, American College of Radiology, Society of Interventional Radiology, and Florida Radiological Society; Member, Board of Advisors, Auronexus, LLC and Automated Clinical Guidelines, LLC.

Douglas Rodriguez MD ’92

Dr. Rodriguez is a native of Tampa. He is a “double alumnus” having obtained his undergraduate degree at the University of South Florida in 1988 and his medical degree from USF COM in 1992. Dr. Rodriguez also completed his residency in Radiology in 1997 at USF and a fellowship in Neuroradiology at Duke University. Following his training he was on staff at Moffitt Cancer Center before joining Radiology Associates of Tampa (currently Radiology Associates of Florida). His current academic appointments include Assistant Clinical Professor, University of South Florida, Department of Radiology and Neurosurgery. He is also on staff at Tampa General Hospital and Sarasota Memorial Hospital. He is serving as a Class Champion on the Reunion Committee for a second year in a row.

Elizabeth Sagatys MD ’03

Elizabeth Sagatys, MD received her medical degree from USF in 2003 and completed residency training at the USF College of Medicine Department of Pathology & Cell Biology in 2007. Following residency, she completed advanced training in Oncologic Surgical Pathology and Hematopathology at Moffitt Cancer Center. She is board certified in Anatomic Pathology, Clinical Pathology and Hematology (Pathology). In 2009, she joined the faculty at Moffitt Cancer Center as an Assistant Member in the Department of Hematopathology and Laboratory Medicine and also obtained courtesy joint appointments as Assistant Professor in the Departments of Oncologic Sciences and Pathology & Cell Biology at the University of South Florida Morsani College of Medicine.

Deborah Trehy BA '75, MD ’78, Obstetrics/Gynecology '82

Deborah Trehy, MD is a triple USF graduate. She completed her BA at USF in 1975, received her medical degree in 1978 and then did her residency here at USF’s Department of OB/GYN graduating in 1982. She is a recently retired Obstetrician-Gynecologist after 30 years in practice. She presently volunteers at the BRIDGE Clinic and serves a leadership role with the Hillsborough County Medical Association. She is one of this year’s Delegates to the FMA from Hillsborough County.


Diane Duffy MD '89

Diane Duffy, MD has been active on the Board since 2009. She lives in North Carolina and is a dual USF graduate - completed her undergrad degree at USF in 1984 and received her medical degree from USF in 1989. She practiced pediatrics in Burlington, NC, for 16 years before joining the faculty at Elon University's Department of Physician Assistant Studies. She is the Director of Clinical Education at Elon. She enjoys serving on the MCOM Alumni Society Board as a way to give back to her alma mater and also to maintain connections with classmates and colleagues.

Carolyn and Dr. Gregory Nicolosi

Dr. Gregory and Mrs. Carolyn Nicolosi were actively involved in establishing the current MCOM Alumni Society. Over the years, they have been instrumental in developing the alumni program by providing background on students and faculty.  Dr. Greg Nicolosi is an emeriti professor from USF and former Executive Associate Vice President - Health Services. Dr. Nicolosi is also an alumnus of USF, graduating with an MBA in 1983. Mrs. Nicolosi is the former Assistant Dean for Student Affairs for the College of Medicine. Both are currently retired and live in St. Pete Beach. Dr. Nicolosi remains involved with other USF Health activities including piping the student procession in the White Coat ceremonies for the MD and DPT programs.

Steven Specter, PhD 

Dr. Specter established the MCOM Student Affairs Scholarship and supports other areas of MCOM as well as WUSF and USF at large. 

Dr. Specter joined the USF medical faculty in 1979 as assistant professor of medical microbiology and immunology. He became a full professor in 1991. Dr. Specter has served the medical college as secretary of the Faculty Council, chair of college committees on space allocation; appointment, promotion and tenure; and curriculum. He was appointed co-director of curriculum and medical education in 1997, then associate dean for pre-clinical education in 1998, he was appointed associate dean for student affairs in 2001. In 2014, Steve became associate dean for alumni relations, and he retired from USF in 2018.

Cyndi Yag-Howard MD ’93

Cyndi Yag-Howard, MD ’93 is Chair of the Reunion Committee of the MCOM Alumni Society and has been active on the Board since 2009. She is a board-certified dermatologist and dermatological surgeon who specializes in skin cancer surgery and facial aesthetics. She is in solo private practice in Naples, Florida. Dr. Yag-Howard received her undergraduate degree from Duke University and her medical degree from the USF Morsani College of Medicine, where she did her residency in dermatology and served as Chief Resident. She now is a member of the volunteer clinical faculty at USF. Since 1990, Dr. Yag-Howard has been an active member of the AMA serving as a delegate of the American Academy of Dermatology and Co-Chair of the entire Dermatology Section Council. She is current Chair of the AMA Council on Constitution and Bylaws. She has also served as Chair of the AMA Specialty and Service Society that includes more than 120 medical specialties, Chair of the House Compensation Committee, Chair of the Rules and Credentials Committee and Chair of the Reference Committee on Legislation. In 2011, 2014 and 2015 she was the recipient of the prestigious American Academy of Dermatology Presidential Citation Award.

Charles Lockwood MD, MHCM, Senior Vice President, USF Health, and Dean, Morsani College of Medicine

Bryan Bognar MD, MPH '08, Internal Medicine '93, Vice Dean for Educational Affairs, Morsani College of Medicine 

Kira Zwygart MD ’98, Associate Dean for Student Affairs, Morsani College of Medicine 

Catherine Warner, Assistant Director of Alumni Engagement, Morsani College of Medicine

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